额济纳天然胡杨林土壤水分特征曲线研究  

A Study on Soil-Water Characteristic Curve of Natural Populus euphratica Forest Stand in Ejina

作　　者：萨如拉[1] 张秋良[1] 王伟峰[1,2] 谢立新[3] 

机构地区：[1]内蒙古农业大学林学院,内蒙古呼和浩特010019 [2]江西农业大学园林与艺术学院,江西南昌330045 [3]内蒙古赤峰市阿鲁科尔沁旗林业局,内蒙古赤峰025550

出　　处：《江西农业大学学报》2009年第2期252-257,共6页Acta Agriculturae Universitatis Jiangxiensis

基　　金：内蒙古自然科学基金重点项目(200711020302);教育部博士点基金项目(20070129005)

摘　　要：通过压力膜法实测土壤水分特征曲线，分析额济纳天然胡杨林3块典型林型的土壤持水特性。结果表明：土壤吸力与土壤含水量之间存在着显著的幂函数关系：p=aS^-k；3种林型同—深度土壤含水量大小依次为：河漫滩胡杨成过熟林〉无植被戈壁滩〉胡杨青壮林，其中河漫滩胡杨成过熟林土壤含水量的变动幅度最大；3种林型不同土层土壤的持水性依次为：河漫滩胡杨成过熟林（60—80cm）〉河漫滩胡杨成过熟林（80～100am）〉胡杨青壮林（80—100cm）〉无植被戈壁滩（60～80cm）〉无植被戈壁滩（80—100cm）〉胡杨青壮林（60～80cm）。回归分析结果表明，该地区的土壤持水力不高，土壤含水率随水势降低而递减的速度较慢，河漫滩胡杨成、过熟林利用水分的能力最强。Through the soil- water characteristic curve measured on -the -spot by using pressure membrane method,the keeping ability of soil - water characteristics in three different experiment region in Ejina natural Populus euphratica forest stand was analyzed. The results indicated that there is a remarkable function relation between soil suction and soil- water content, and its mathematical model is：θ = αaS^-b ;The soil -water contents in three forestry types in the identical depth show the sequence of：No. 2 experiment region 〉 No. 3 experiment region 〉 No. 1 experiment region, the biggest changing scope of soil - water content is No. 2 experiment region ; The retainable property of the different depth soil - water in this three experimental region is not high：No. 2 experiment region （60 ～80 cm） 〉 No. 2 experiment region （80 ～ 100 cm） 〉 No. 1 experiment region （80 ～ 100 cm） 〉 No. 3 experiment region （60～80 cm） 〉 No. 3 experiment region （ 80～ 100 cm） 〉 No. 1 experiment region （60～80 cm） ; The regression analysis result indicates that soilwater retainable property in this area is not so high, the speed of soil - water content rate which along with the decreasing of water potential reduces slow. Ability of making use of water for No. 2 experiment region （ the mature and overmature Populus euphratica forest stand in the two -bridge area ） is the strongest.

关 键 词：额济纳 胡杨林 土壤水分特征曲线 

分 类 号：S714.7[农业科学—林学]